US4421405A - Multiple mode copying apparatus - Google Patents
Multiple mode copying apparatus Download PDFInfo
- Publication number
- US4421405A US4421405A US06/382,100 US38210082A US4421405A US 4421405 A US4421405 A US 4421405A US 38210082 A US38210082 A US 38210082A US 4421405 A US4421405 A US 4421405A
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- US
- United States
- Prior art keywords
- cam
- lens
- magnification
- movement
- copying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000006243 chemical reaction Methods 0.000 claims abstract 5
- 230000003287 optical effect Effects 0.000 description 21
- 238000010276 construction Methods 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/041—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with variable magnification
Definitions
- This invention relates to multiple mode copying apparatus provided with an optical system capable of varying the multiplication of images formed, and more particularly it is concerned with a multiple mode copying apparatus equipped with a mechanism capable of effecting both magnification and reduction.
- a light irradiation position for a document to be copied and an exposing position in which a photosensitive member is exposed to an optical image of the document are both fixed, and an optical system for introducing light beams irradiating the document to the photosensitive member includes a lens and mirrors to obtain an overall compact size in a copying apparatus.
- an optical path is complex to allow the light beams to be reflected several times. The more complicated the optical path, the more complex becomes a magnification varying mechanism.
- the invention has been developed for the purpose of obviating the aforesaid disadvantages of the prior art. Accordingly the invention has as its object the provision of a multiple mode copying apparatus capable of performing copying both in reduction and in enlarging modes by using a single multiple mode copying mechanism of simple construction.
- FIGS. 1-3 are views showing the relation between the subject, the lens and the image forming surface when magnification is varied for each copying mode, FIG. 1 being a view of the relation obtained in reduction mode in which the main light beam coincides with the optical axis, FIG. 2 being a view of the relation obtained in magnification mode, and FG. 3 being a view of the relation obtained when the main light beam obliquely intersects the optical axis;
- FIG. 4 is a view in explanation of one example of the image forming optical system generally used with a copying apparatus
- FIG. 5 is a plan view of one example of the magnification varying mechanism of the prior art
- FIGS. 6 and 7 are schematic views in explanation of the principle of the invention.
- FIG. 8 is a plan view of an embodiment of the magnification varying cam according to the invention.
- FIG. 9 is a plan view of the magnification varying mechanism of a copying apparatus using the magnification varying cam shown in FIG. 8 for effecting copying both in magnification and reduction modes;
- FIG. 10 is a side view of the magnification varying mechanism shown in FIG. 9.
- FIG. 1 shows the movement of the lens and the image forming surface that occurs when copying is effected in reduction mode.
- it is necessary to move the lens A closer to the surface of the document as shown in FIG. 2, and the value of ⁇ a becomes negative but the aforesaid relation still holds.
- oblique light beams in which the principal light beam does not coincide with the optical axis of the lens or it tilts an angle ⁇ with respect to the optical axis are used in many cases.
- the following relations will hold if the distance covered by the movement of the lens with respect to the subject, the distance covered by the movement of the image with respect to the lens, and the distance covered by the movement of the image forming surface in the direction of movement of the principal light beam are denoted by a', b' and L' respectively in FIG. 3: ##EQU4##
- the direction of movement of the various elements of the optical system is in the direction of the principal light beam which tilts an angle ⁇ with respect to the optical axis.
- FIG. 4 shows an image forming optical system usually used with an electrophotographic copying apparatus.
- a document 2 placed on a contact glass member 1 is scanned by light beams emanating from a light source 3 movable to the left and right in the figure.
- the light beams reflected by the document 2 are again reflected by a first mirror 4 moving with the light source 3 as a unit, by a second mirror 5 moving in the same direction as the light source 3 at a speed half the speed of movement of the light source 3 and by third and fourth mirrors 7 and 8 after passing through an image forming lens 6, to form an image on the surface of a photosensitive drum 9.
- the optical path from the surface of the document 2 to the surface of the photosensitive drum 9 is kept constant at all times.
- first mirror 4 and second mirror 5 the document 2 may be moved at a constant speed.
- a cam 10b for converting the distance covered by the movement of the lens 6 into a rotational angle
- a cam 10a for moving the third and fourth mirrors 7 and 8, the cams 10b and 10a being formed on a single cam member 10.
- the cam member 10 comprises a cam surface of the cam 10b for following up the movement of the lens 6 which is in the form of a straight line, and a cam surface of the cam 10a for moving the mirrors 7 and 8 which is in the form of a curve.
- the distance ⁇ a covered by the movement of the lens becomes positive in reduction mode and negative in magnification mode, as described hereinabove.
- the distance ⁇ L' covered by the movement of the image forming surface is expressed by the following equation: ##EQU5## so that ⁇ L' is positive at all times regardless of whether the magnification m is larger or smaller than unity.
- the principal light beam coincides with the optical axis.
- the same explanation applies even if the principal light beam is tilting with respect to the optical axis.
- the distance L between the subject and the image forming surface is minimized when copying is effected without magnification and reduction and becomes larger when copying is effected both in magnification and reducing modes than when copying is effected without magnification and reduction.
- magnification varying mechanism of the prior art described hereinabove is adapted for use with copying apparatus for effecting copying without magnification and reduction and in reduction mode only.
- the cam surface of the cam 10a is profiled such that it is a smooth curve having no peak to allow the mirrors 7 and 8 to move leftwardly when the lens 6 moves leftwardly.
- a magnification varying mechanism capable of accomplishing the object without any trouble, for the following means.
- reduction mode both the lens and mirrors move leftwardly, but the lens moves rightwardly while the mirrors move leftwardly in magnification mode.
- the cam surface of the cam 10b is in the form of a straight line
- the cam surface of the cam 10a would have a steep angular form with a vertex serving as a point of engagement by the cam follower when copying is effected without magnification and reduction. This causes a sudden change in the shape of the cam surface, making it difficult to fabricate the cam member and also making it difficult for the cam follower to be kept in engagement therewith.
- the lens 6 moves leftwardly as indicated by an arrow A and the third and fourth mirrors 7 and 8 move leftwardly as indicated by an arrow B, when copying is performed in reduction mode.
- magnification mode the lens 6 moves rightwardly as indicated by an arrow A', and the mirrors 7 and 8 move leftwardly as indicated by the arrow B.
- a magnification varying cam member 11 formed with two cam surfaces or a cam surface 11a and a cam surface 11b as shown in FIG. 8.
- the second cam surface 11b which follows up the movement of the lens 6 is in smooth arcuate form and profiled such that as cam follower 12 moves past a contact point for copying without no magnification and reduction, the direction of pivotal movement of the cam member 1 about a pivot 13 is reversed.
- the cam member 11 moves in pivotal movement clockwise about the pivot 13 in the figure, and the first cam surface 11a is of simple configuration to allow a cam follower 14 to move in one direction as the cam member 10 pivotally moves in one direction.
- the second cam surface 11b By selecting a suitable profile for the second cam surface 11b, it is possible to give such a profile to the first cam surface 11a to be in a straight line, thereby facilitating fabrication of the cam member 11 and increasing the accuracy with which operation is performed.
- the end can be attained by accurately selecting the projections at points on the cam surface which correspond to the desired magnifications and connecting the projections together by a continuous curve of a suitable shape.
- magnification mode when the lens is moved rearwardly (righwardly in the figure), the cam member 11 also follows the movement of the cam follower 12 and pivotally moves clockwise about the pivot 13 and the cam follower 14 moves forwardly by following up the movement of the cam surface 11a, to allow the lens and mirrors to move in the opposite directions while being maintained in the relation expressed by equation (8).
- the profile of the cam member 11 is smooth enough to enable magnification varying to be effected with a high degree of accuracy.
- a lens and mirror moving mechanism of the multiple mode copying apparatus comprising one embodiment of the invention capable of effecting copying in magnification and reduction modes by using the magnification varying mechanism according to the invention will be described by referring to FIGS. 9 and 10.
- a lens moving carriage 16 has attached to its undersurface a follower 21 engaged in a gap between two members of a bifurcated portion 20a formed at a free end of a lever 20 pivotally supported at a pivot 19 for movement through a cam 18 mounted at a lower end of a shaft of a drive motor 17.
- the lens moving carriage 16 is driven by the motor 17 and moves back and forth.
- a guide cylinder 22 secured to an upper portion of the carriage 16 is loosely fitted for sliding movement over a guide rod 23 secured horizontally to a machine frame lengthwise thereof. As the lever 20 moves in pivotal movement, the lens moving carriage 16 moves back and forth in linear motion along the guide rod 23.
- a tension spring 25 is mounted obliquely between an intermediate point on the lever 20 and the machine frame. This keeps a cam follower 24 mounted on the lever 20 in contact with the cam 18 at all times, to enable the lens moving carriage 16 to move as designed without failure and to be kept in place in the desired position.
- the microswitch 29 When the follower 28 is brought into engagement in the cutouts of small depth 26b, only the microswitch 29 is actuated and produces a signal or signals inputted to a control and the number of the inputted signals is counted.
- the desired magnification varying position is detected based on the number of times the switch is actuated as counted from the position of copying without magnification and reduction. If the detected position agrees with the magnification rate set by the operator, then rotation of the drive motor 17 is interrupted. In the vicinity of the position in which the motor 17 is brought to a halt, the cam 18 is profiled such that the peripheral edge is in the form of a circular arc centered at the center of rotation of the cam 18.
- the cam follower 12 is mounted on the surface of the lens moving carriage 16 and in engagement with the second cam surface 11b of the magnification varying cam 17 pivotable about a shaft 13 secured to the machine frame.
- the magnification varying cam 11 is a cam of the cam profile according to the invention described in detail in the foregoing description.
- the third and fourth mirrors 7 and 8 are mounted on a mirror bracket 36 provided with a guide cylinder 37 extending lengthwise to allow a guide rod 38 secured to the machine frame to extend in the direction of movement of the mirrors to be loosely fitted therein for sliding movement.
- the cam follower 14 mounted on the surface of the guide cylinder 37, and a compression spring 39 is mounted between a rear end of the guide cylinder 37 and the machine frame. This brings the cam followers 14 and 12 into pressing engagement with with first cam surface 11a of the magnification varying cam 11 and the second cam surface 11b respectively at all times.
- the mirrors 7 and 8 move back and forth while being kept in the predetermined relation as described hereinabove.
Abstract
Description
Δm=d cos 1/2α (1)
d sin 1/2α+e=c (2)
ΔL'/2=d+e-c (3)
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56079150A JPS57195260A (en) | 1981-05-27 | 1981-05-27 | Variable magnification copying device |
JP56-79150 | 1981-05-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4421405A true US4421405A (en) | 1983-12-20 |
Family
ID=13681923
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/382,100 Expired - Fee Related US4421405A (en) | 1981-05-27 | 1982-05-26 | Multiple mode copying apparatus |
Country Status (2)
Country | Link |
---|---|
US (1) | US4421405A (en) |
JP (1) | JPS57195260A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4552453A (en) * | 1982-10-14 | 1985-11-12 | Sharp Kabushiki Kaisha | Lens positioning mechanism for a copying machine |
US5049926A (en) * | 1989-01-27 | 1991-09-17 | Brother Kogyo Kabushiki Kaisha | Image recording apparatus having a mechanism for varying copying magnification |
US5055872A (en) * | 1989-01-20 | 1991-10-08 | Brother Kogyo Kabushiki Kaisha | Image recording apparatus having image magnification control means |
US5450175A (en) * | 1993-07-27 | 1995-09-12 | Konica Corporation | Image forming apparatus having optical means for image magnification change |
US5581333A (en) * | 1991-11-08 | 1996-12-03 | Canon Kabushiki Kaisha | Original image focusing apparatus having positionally adjustable focus lens |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59181436U (en) * | 1983-05-19 | 1984-12-04 | ミノルタ株式会社 | Magnification changing device in copying machine |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4077715A (en) * | 1977-02-18 | 1978-03-07 | Itek Corporation | Adjustable optical cam |
US4093374A (en) * | 1976-01-12 | 1978-06-06 | Xerox Corporation | Multiple range variable magnification reproduction machine |
US4099866A (en) * | 1976-12-08 | 1978-07-11 | International Business Machines Corporation | Focal adjustment on a single-focus lens in a continuously variable magnification system |
US4142793A (en) * | 1977-12-09 | 1979-03-06 | Minnesota Mining And Manufacturing Company | Variable speed drive apparatus for the scanning system of a copy machine |
US4209248A (en) * | 1976-09-07 | 1980-06-24 | International Business Machines Corporation | Continuously variable reduction copier optics systems |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5365736A (en) * | 1976-11-25 | 1978-06-12 | Ricoh Co Ltd | Variable magnification copier |
JPS5441723A (en) * | 1977-09-09 | 1979-04-03 | Canon Inc | Optical device for copier |
-
1981
- 1981-05-27 JP JP56079150A patent/JPS57195260A/en active Pending
-
1982
- 1982-05-26 US US06/382,100 patent/US4421405A/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4093374A (en) * | 1976-01-12 | 1978-06-06 | Xerox Corporation | Multiple range variable magnification reproduction machine |
US4209248A (en) * | 1976-09-07 | 1980-06-24 | International Business Machines Corporation | Continuously variable reduction copier optics systems |
US4099866A (en) * | 1976-12-08 | 1978-07-11 | International Business Machines Corporation | Focal adjustment on a single-focus lens in a continuously variable magnification system |
US4077715A (en) * | 1977-02-18 | 1978-03-07 | Itek Corporation | Adjustable optical cam |
US4142793A (en) * | 1977-12-09 | 1979-03-06 | Minnesota Mining And Manufacturing Company | Variable speed drive apparatus for the scanning system of a copy machine |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4552453A (en) * | 1982-10-14 | 1985-11-12 | Sharp Kabushiki Kaisha | Lens positioning mechanism for a copying machine |
US5055872A (en) * | 1989-01-20 | 1991-10-08 | Brother Kogyo Kabushiki Kaisha | Image recording apparatus having image magnification control means |
US5049926A (en) * | 1989-01-27 | 1991-09-17 | Brother Kogyo Kabushiki Kaisha | Image recording apparatus having a mechanism for varying copying magnification |
US5581333A (en) * | 1991-11-08 | 1996-12-03 | Canon Kabushiki Kaisha | Original image focusing apparatus having positionally adjustable focus lens |
US5450175A (en) * | 1993-07-27 | 1995-09-12 | Konica Corporation | Image forming apparatus having optical means for image magnification change |
Also Published As
Publication number | Publication date |
---|---|
JPS57195260A (en) | 1982-11-30 |
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